when generating documentation helper, do not fail if no description

defined in property sheet


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34700 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Base.py

@@ -3640,7 +3640,7 @@ class Base( CopyContainer,
               continue
             seen_properties.append(property)
             subdochelper = newTempDocumentationHelper(dochelper, k,
-                      title=property['id'], description=property['description'],
+                      title=property['id'], description=property.get('description', ''),
                       type=property['type'], security=property['mode'],
                       content=pformat(documented_item.getProperty(property['id'])))
             subdochelper_dynamic_accessor_list = []